﻿using System.Collections.Generic;
using System.Diagnostics.Contracts;

namespace System.Reactive.Linq
{
	public static partial class Observable
	{
		public static IObservable<TResult> Never<TResult>()
		{
			Contract.Ensures(Contract.Result<IObservable<TResult>>() != null, null, "Contract.Result<IObservable<TResult>>() != null");
			return null;
		}

		public static IEnumerable<TSource> Next<TSource>(this IObservable<TSource> source)
		{
			Contract.Requires(source != null, null, "source != null");
			Contract.Ensures(Contract.Result<IEnumerable<TSource>>() != null, null, "Contract.Result<IEnumerable<TSource>>() != null");
			return null;
		}
	}
}